The selection of gasket, bolts and flange materials for elevated temperature service requires knowledge of the operating temperature that the joint components will see during service. There are guidelines in ASME B31.3 for approximate temperature reductions of 10% and 20% for the flange and bolts, respectively. However, it is not made clear if that approximation can also be applied to gaskets. In addition, the background for the limits and level of conservatism of the B31.3 approximations is unknown. This paper examines the operational temperature of joint components for a range of standard B16.5 and B16.47 flanges in different services in order to confirm the level of conservatism of the B31.3 limits, identify any limits to those approximations and outline appropriate gasket temperature assumptions.

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